What version of pi are you using?
Are you sure that the board will work the the version of pi you have attached it to?
What is the output of cat /etc/asound.conf ?
To edit the config file you simply need to use 'sudo nano /boot/config.txt' - Then when changes done use ctrl-o to save and ctrl-x to exit and reboot the pi.

You do not need admin (root) pw
Put card into your card reader, plug reader into usb port of your (Windows)-PC and edit config.txt file on first partition on sd-card (this VFAT partition, so you do not have any problems from Windows side)

append lines to config.txt described in "For RuneAudio" section in the link you posted in your first post

# Please note, this setting should be commented out if a Hifiberry
# device is used.
# dtparam=audio=on
#dtparam=i2s=on
dtoverlay=iqaudio-dacplus
works too:dtoverlay=iqaudio-dac
dtoverlay=lirc-rpi,debug
dtoverlay=lirc-rpi,gpio_out_pin=17,gpio_in_pin=22,debug